cache character end point - update reply count/thread reply id

lib/myapp/data/reply.ex

@@ -1,6 +1,7 @@
 defmodule MyApp.Data.Reply do
   use Ecto.Schema
   import Ecto.Changeset
+  import Ecto.Query
   alias MyApp.Repo
   alias MyApp.Data
 
@@ -35,6 +36,20 @@ defmodule MyApp.Data.Reply do
     insert_changeset(%Data.Reply{}, params)
     |> Repo.insert
     |> Data.Util.process_insert_or_update
+    |> update_thread_new_reply
+  end
+
+  defp update_thread_new_reply({:error, error}), do: {:error, error}
+  defp update_thread_new_reply({:ok, reply}) do
+    thread_id = Map.get(reply, :thread_id)
+    user_id = Map.get(reply, :user_id)
+    query = from t in Data.Thread, where: t.id == ^thread_id,
+      update: [set: [last_reply_id: ^user_id], inc: [reply_count: 1]]
+
+    case Repo.update_all(query, []) do
+      nil -> {:error, "update thread error"}
+      _ -> {:ok, reply}
+    end
   end
 
   @spec user_update(map) :: {:ok, map} | {:error, map}

lib/myapp/data/thread.ex

@@ -16,6 +16,7 @@ defmodule MyApp.Data.Thread do
     field :sticky, :boolean, default: false
     field :locked, :boolean, default: false
     field :edited, :boolean, default: false
+    field :reply_count, :integer, default: 0
     has_many :replies, Data.Reply
     has_one :user, Data.User, foreign_key: :id, references: :user_id
     has_one :last_reply, Data.User, foreign_key: :id, references: :last_reply_id
@@ -24,7 +25,7 @@ defmodule MyApp.Data.Thread do
 
   defp insert_changeset(thread, params \\ %{}) do
     thread
-    |> cast(params, [:title, :category_id, :content, :user_id])
+    |> cast(params, [:title, :category_id, :content, :user_id, :last_reply_id])
     |> validate_required([:title, :category_id, :content, :user_id])
     |> foreign_key_constraint(:category_id)
     |> foreign_key_constraint(:user_id)
@@ -66,6 +67,9 @@ defmodule MyApp.Data.Thread do
         :edited,
         :content,
         :category_id,
+        :title,
+        :view_count,
+        :reply_count,
         user: [:id, :battletag],
         last_reply: [:id, :battletag],
       ]),
@@ -85,6 +89,7 @@ defmodule MyApp.Data.Thread do
 
   @spec insert(map) :: {:ok, map} | {:error, map}
   def insert(params) do
+    params = Map.put(params, "last_reply_id", Map.get(params, "user_id"))
     insert_changeset(%Data.Thread{}, params)
     |> Repo.insert
     |> remove_associations